Advertisements
Advertisements
प्रश्न
What is meant by the term ‘Atmospheric Pressure’?
Advertisements
उत्तर
Atmospheric Pressure refers to the force per unit area exerted against a surface by the weight of the air above that surface. The pressure is expressed in millibars (mb) and measured with a mercury barometer. The average atmospheric pressure at sea level is 1013.25 mb or 760 mm (the) height of the column of mercury in a barometer at sea level). Atmospheric Pressure decreases with height.
APPEARS IN
संबंधित प्रश्न
Fill the missing word in the blank spaces in the following statements:
Air moves from a region of __________ pressure to a region of ________ pressure.
Name the physical quantity which is expressed in the unit 'atm'. State its value in pascal.
A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change: increase, decrease or remains same, inside the (a) bell jar, (b) balloon?
Draw a simple labelled diagram of a Fortin barometer and state how it is used to measure the atmospheric pressure.
At sea level, the atmospheric pressure is 76 cm of Hg. If air pressure falls by 10 mm of Hg per 120m of ascent, what is the height of a hill where the barometer reads 70 cm Hg. State the assumption made by you.
Select the correct option.
As we move upwards, the atmospheric pressure
State briefly, how and why the atmospheric pressure of a place varies with the altitude. Draw an approximate graph to illustrate this variation.
Clouds float in atmosphere because of their low ______.
______ is used to show the distribution of air pressure.
The human lung is well adapted to breathe at a pressure of ______ k Pa.
